Oops. Struck a nerve with Chadly. I’ve been super happy with the performance of the four 872 engines I’ve had. I had Roosterbuilt set up the clutching and we ended up with 4 grams more than the base setup on their Big Bore Kit. I’ve also seen first hand how they out perform stockers in deep snow side by side. My 872 174 XM has more pull up top then my 850 175. The 850 seems to be a little stronger down low and in the middle tho. They don’t yank like a turbo but they run dawn to dusk day after day after day. I ride with my two sons and it would have been a nightmare to try and keep 3 turbo sleds running.